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Author Topic:   1999 17 outrage 135 optimax runs rich at trolling rpm's
eriedeary posted 08-03-2002 02:59 PM ET (US)   Profile for eriedeary   Send Email to eriedeary  
hi in advance i'd like to thank moderator for this board, bought a new 17 outrage new off the floor last year (3/2001). fish erie out of cleveland and do allot of trolling. this season "summer 02" have been running rough at low idle trolling speeds to the point where the engine has bogged out or hard to blow out. contacted dealer and changed plugs. still the same problem after only a couple hours on these plugs. recontacted dealer to learn that a check valve system had not been installed. not familiar with this and will be water testing boat tomorrow myself. what is the problem with this motor at low speeds for long lenghs of time and is there anything I can do to help it run better at low rpm's. no problems at top end cruising speeds.
in earnest,
will follow up with specifics because this is a real pain, thanx again rh

dauntlass 18 posted 08-03-2002 04:09 PM ET (US)     Profile for dauntlass 18  Send Email to dauntlass 18     
I had a 1998 Optimax 150 which needed a recall for plug fouling that required a ck valve change.The recall corrected problem.It may be worth your while to contact Mercury with engine number to see if there are any recalls that have not been performed.I have had two Optimax engines and I like them.
tully_mars posted 08-03-2002 06:27 PM ET (US)     Profile for tully_mars  Send Email to tully_mars     
Also check your dealer on an "after break-in" adjustment. My Mercury EFI's ran really rich at idle and would foul plugs which I complained about at a service check. Got the motors back and they now run much better.

Tully Mars

ivansfo posted 08-06-2002 04:07 PM ET (US)     Profile for ivansfo  Send Email to ivansfo     

What oil do you feed your Optimax? I have a pair of 2001 135 Optimax and after 30 hours on them, I haven't noticed any problems when trolling. So far I've been using Merc Opti oil.

I looked at Penzoil Synblend and Chevron TC3 oil and they look a little thicker than the Merc oil.

I should note that after I troll for a couple of hours, I do notice more smoke and when I blow it out.


littleblue posted 08-07-2002 02:10 AM ET (US)     Profile for littleblue  Send Email to littleblue     
have a question for u guys w/ optimax. The other day while coming back from fishing in a no wake zone I was following pretty close to a bayliner trophy w/ a 150 optimax, looked pretty new. The thing is that the engine was loud. Also it didn't even sound like a normal engine, the sound was hard to describe but very weird mettallic sounding. Is this just how optimax engines sound??
ivansfo posted 08-07-2002 10:47 AM ET (US)     Profile for ivansfo  Send Email to ivansfo     

You are absolutely right about the noise of the Optimax. At idle they are average in terms of noise. But when running those suckers are damn noisy. I have a hardtop with weather curtains on my conquest so this might be compounding the problem by trapping the noise.

This my only gripe about my motors so far.


Drydock posted 08-07-2002 12:16 PM ET (US)     Profile for Drydock  Send Email to Drydock     
I bought my 135 used with about 190 hours on it. I used it about 4 or 5 hours the remaining part of the first season I had it before getting it into a shop for a check. My primary problem was that it was difficult to start (when cold) it would die until about the 4th or 5th start. Once it kept running and got warmed up no problem. The shop that did my tune up is a pretty reputable and honest bunch of guys. They told me the plugs were fouled and it looked like there had been no maintenance since it was new. They said that the computers automatically run the engines pretty rich for a certain number of hours for break in and this frequently fouls the plugs. They suspected that the new or cleaned plugs would fare much better. As far as the difficult starts they recommended I try it with just the tune and new plugs and ensure fresh gas, because step 2 would be much more expensive (something about a modular piece that cannot be adjusted only replaced.) Also recommended using a new Optimax only oil.
The motor still dies 3 or 4 times until it is warmed up (It does start with a very slow idle).
As far as noise, It is noisy, I cannot hear my VHF unless it is very close to my ear when running at more than 2500 rpm.
eriedeary posted 08-08-2002 10:46 AM ET (US)     Profile for eriedeary  Send Email to eriedeary     
thanx for replies,
still haven't had an opportunity to water test as of 8-8. hope to this weekend. as for oil I have only used the opti oil but dealer told me a merc bulletin did come out saying you don't "only" have to use that oil. will continue to run it though until i see it in writing or hear about a better substitution. the check valves are now installed and hope it makes a difference, also cleaned the plugs. may try some qiik-lean with every tank as i've picked that up in some articles or letters.
Swellmonster posted 08-08-2002 01:06 PM ET (US)     Profile for Swellmonster  Send Email to Swellmonster     
Anything near a Bayliner turns to junk. What a shame he has an opti...
Their is a good site to look at about motors. Look at, fastfish is good with em.....
optimax sucks posted 08-28-2005 12:30 AM ET (US)     Profile for optimax sucks  Send Email to optimax sucks     
I have a 2001 135 optimax. Bought it brand new and complained for three years about how rough it was (its like it has parkensons diesese when trolling) mercury finally upgraded the fuel injectors two versions, all new plugs (titanium instead of platinium) and a $0.30 oil ring to keep water out of the injector rail (total $3000). It worked 10 hours later, the damn thing is broken again, 4th year in a row. The Check Engine alarm starts beeping as I am idling into the dock and then the idle RPM gets stuck on 1000 RPM from the 540. Very dangerous when trying to dock in 2 ft swells.

I'm back onto the phone, Time to call Mary at mercury again

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